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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '845bd127c52a4e14afe7805dc4ae460ba75e0afdc251bfec1a0f217b8018f428' 
  AND token = 'oYYcac51NZY51mYmTWeL7a9a9NY1O9W3b3qgopxYnAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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