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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a772fdd640ce835564054aa8d8c58d6daa8d35050f56aa32de42c973b45c837d' 
  AND token = 'hYyHR9AV8p4kEAHLdJ+wSjTHmum1NbAH/mneObx+izE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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