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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3073b9d798db61e266d79b50f96e8617e72cfa03e5a3cf4c740d152ba348eac9' 
  AND token = '16wKl/AwCnc8spqKcAqemcHfB7Ac0nM/a0BjbAtdk7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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