SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952ec554fdf8d18dea63a6df9ca7b11c9af1b73b92796dbbf58cd0687754129c' 
  AND token = 'mi/wH3WoylZDSSjqNgoQnTGq3wpXYsbVsKIwW3LhYYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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