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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6156e00b9f35158b7c4a72ff93f61ff6fd2f913d66f349bf94a14e8781274c97' 
  AND token = 'pqb38QSyC5783buktCzNz/9/tuTPvaILfMy8hf9SL64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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