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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c924a09b99aff9872c40a6af9110b16e7a67d13c23545cbf72088941ddd827fc' 
  AND token = 'ojV76r0WoGi/EQ2Rl2QimndQ3Igsc29U8aKLoMbFd8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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