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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc59994e8aa457d825a4cfbc0d454d670d9cc1012a962b89791427d72d8dd31d' 
  AND token = 'qdUh8hr629XknumPAitNUGOJ+b0Sk1y9eAxEM+dbLYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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