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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88b2a773a6373bfd4a25d5ba6bc3b31d5bb65fc6cbc794ec5521afc1e720a33' 
  AND token = 'stWoNKUZ55BUebx2wAYI2kuia9E0nlkB59L5hUe0BR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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