SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223fc7555784dfb0a52c267603b8cac8584fd736238809f599525a93309d01cb' 
  AND token = 'CoHm+vzlP3ZOp8Hb9LRJAzfhaF6INDBt/BlzAA+6p4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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