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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d4bce27bd43a6eb49f71a4fa26f25c17188b22e3349a826a092453eacbf43d' 
  AND token = 'K3r1LBdkB/sn2+jPXzTogZmc8iIWw1sCbP980t+Msj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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