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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcfa4b55398ad6a216c50e033ef85259d2d00da1b896d36115bfb67a481e751' 
  AND token = '0chRlzBOLvB19AEAa9NQ9OjdaxDZQNS84M5Z4yJCi6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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