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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc93e7db9f6cf5c21104224989f11005eea33726cf681af638c2db7260765bbe' 
  AND token = 'Qx7NStMQvDBhWz8Zyy5f5sv8kceIC4iXxZC2LcOJe6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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