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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de39691d825fdda9205945152fd84d35b4486a57762fdfc0fd82d8c61b112aa' 
  AND token = 'dAHReR0MHyirqbgMm5oYlB6xc67UIsCyz5qxlNJfAss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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