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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf52394b44e8b5cbfca4a983d1dfd479395ab1a5f5d90fc54f03b0c43b73fdf8' 
  AND token = 'W/Co5xIOeYonTRGqiCuA/jpV/p8yc3EzqTD6tsnuIao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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