SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dffb5d1791acf67f6190f40e755445f1719bcd85697f49a9cfb07237313cbeb9' 
  AND token = 'wSGvhQD7mCjLFBQC0Z+tP6XwYiptpgXQDbCekRsCnVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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