SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02488d8ffc6dca93b9605c27d25c06ac9a1617524d3db487526b5ec3740ec173' 
  AND token = 'aqF6XfzUJPJJd1rTVLvUns+WYtgspw59VykJwhb3ghY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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