SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d0c70629288db3d4089df27d7f254cc6b8113eda9048790493d996c2d773ce' 
  AND token = 'x09iXuBCJLAk5i4p0+v4XzAFummLIpQs0yjzFgklhqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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