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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804eb901ddf4504b483f1fd2e10d211f964fea1118e42f04366b3648a1b7b472' 
  AND token = 'UKjhWBDDdzV3NVsojTLrtfO17hHCJm2D/wP5psFWnVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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