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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131224ec3886fb3345368104e95f04f1653c5744b296693b664582cf7ea3ea34' 
  AND token = 'miS0Kwtv8IOCFPcjtR548geqr5oD74VxpIgpjO//LHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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