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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81252e1391e828b3ac25044983df3a7cac0e91458bd831684fbf0918b61a5aa' 
  AND token = '6jJkTd378G3DyWY8msr8qPWEIK7JypWfxft0CrrBfWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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