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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa67adbe94755669c454a85c8d0fa84b238e60e4106d92fa8b764e917b84ffc7' 
  AND token = 'hHIStfbNfcWb4FLBIT1KxhdJhUdZ2WNeJjC4Rj/fE90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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