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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412f15e0b7139d61dfbfd5785636ed2a7a8250de6c11974f39744e239655e51b' 
  AND token = '3bGFzgPRvTO701Clj1oktNP0zXvUSHXA8Xmisndww7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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