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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab71fe752fe73ea91e1779f784a51b5235219fdf277fa7e8e00dae908ec70a2' 
  AND token = 'ceU76MwtzJ2xXruM12u/wo9jwEF/+mY0gn040txDsAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}