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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf539a0093d47c4382e957d6679294c2f671b3df6d53271177f5b8ae8519d43' 
  AND token = 'bz3HiJMeHIiKh4E3rFLyebcAPC3XEl1unYaDtoWmu5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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