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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec6c6b9667c133892f6f4b6eb2ac0e3cf0d49e77c31e6e065b3a4cea3611190' 
  AND token = 'dXJkH9Y7/jm8ncdqgQSTUDCB5gOk2wISJPa6A4pYAvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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