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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ee7b31c84896555c99f0b02f4c8cafa299a548aa15a04c0cde8767e81ea6ce' 
  AND token = '5c3eKOOCX1F9tH8Gh27TJ78UgNIBudmFId+pdNOnhNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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