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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683c04190554c0898ae6846c85140c2bec6f0a04698705cf09533b3f8b3aee0b' 
  AND token = 'PPkCFJxGbuVdh3f2kJlbP0R4QSdBceS+0efHCV3BJJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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