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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fda50f065baa1146bbec1804d8f340f6be4a5c56e4ac961ada536e77d79cc7b' 
  AND token = 'KYbkVx/MYSD6o3+oPHJTQ/WkOn2JeYOf7E2G+L+TElM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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