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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13179db940eb4dc2a77299089040be2486edc726b9655a745471ab4b16345cb3' 
  AND token = '6U2uNajMQKn2G/ajcS2Tn8jriQ4HQS4FwRI6cc5ftLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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