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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec19d067766c7bba793bc61998aa55a9dbe4a9e90ee84935ae75f57085850bb' 
  AND token = '0QnffOPk7jOUvgbl+MOyI0shptQDRCOzcVJ19H0/dq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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