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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b47cb053adb713103f89a4375f5f1362f8eebff63f6e29099eeabb342128cc6' 
  AND token = '+aGWUUXVQ/kOr7VekT1Z4ESk5Mn9LDOzSx4qXO7ZFfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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