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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565229715b125e33b21b2e6ae57381f8326f18cda0f3efd3c6d966ae9ff03b67' 
  AND token = '3Snp/fbVuTXbr8lnW0K7KzshYZZYyO7MQHtCIW1coYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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