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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096db60aa694afeb36173ee8e764f4029a1ba16cffecd0bcc7a49587a97ab739' 
  AND token = 'McGqLcFM0OWDyEqqogprYqOYphaT0TddiwHB4jPaQTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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