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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479bbf1395542cdc4477237b474a5108dbfea963d35d2fd674cf663804cf756b' 
  AND token = 'XXRh7e6MDJb79b8zxJ0AG1LhBYeRYP46YMGtV27d4d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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