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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6550c82eb854d7489d5da491521fa68430c615d5c95a71db46daac7a28f97632' 
  AND token = 'fucc3KWhPvWjhGB48Cc8N7LKlOucW2aECd4EZu0cN9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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