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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0495d0dbd8aa6264b5b761f31182c9d84a1fa80e55052541f10f91941e2259ca' 
  AND token = '19D346HgmZ0qf1KyUeiNzI0IrxkiKYSeZxZ0wrQ6zcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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