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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80baebbde922d822f528fbe132881421b2ac0632afefb51af7c0a414149f8ec' 
  AND token = '1W/J2faXAS32n1dW13V75lnCjmu8rT0F/kCs2mQfZKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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