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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237731dd82ed70ba68275f282210f2ff3d3bab627ec4ae01692a914073864449' 
  AND token = '1QwAkTd1V3O5GleC+Y/n3Kqto7g22QuReebq81lzYsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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