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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3a6d5a20c9cfa43ee5d9d74335aad4121828ad59f105b7bbb50464415dc4f8' 
  AND token = 'P6GE+/0h0RvV7cmJ3cSiydEfocMmiGXFUXEJVZlcRb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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