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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0e33ee0d1b9d34d1eb349747c0b420d700a4d2d59f3c7ea6b8c63bd101cf5a' 
  AND token = '5CFezP+0zKVJGEKUzGQnW4H46VZ3HV8JojvCXhYEtcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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