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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f710370be6cf08af3e271cc1b3466cfaf51f825a83200a6c9988d6aab37761' 
  AND token = 'pBnHyr8tqQtlbz9ZVhLIjQT07LFAEdF417IEev2CwSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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