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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232c2389349f01dd7a6ae887b4c5c178437374592e9b43ea382eb0150e49496a' 
  AND token = 't7wIM8TytHJHI44DEvyJ+4UBWxTo7C6LX1ioHhZwdQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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