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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a79be54fb3ade69acd4ba0367aa2849c29de861ead199469e36202d44d865b1' 
  AND token = 'mpchVINLq0rJzkVsO6JGEZXFMsggNhdchNy9Bl1R2e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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