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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5f9e68bb0b038cade1f053107162ea351918ab8d2e9aa3d15147237da5e832' 
  AND token = 'QjSAxe+yhJKj3AE12t7Y6eQ8IbtmLYXp61PuwZUlzyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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