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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097cecfa78d855127dcb14ed3d4e4b9e1cd84b9e1f28543fa5c6d4612b0b80a8' 
  AND token = '8VnJq2NRdvg7V92QrMBSakKjkv1DRffrhZOXVZyh8zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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