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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f4e87d9595fb9dde0d317d5dbb984a3939df42dabaac91510d1ed6659ae446' 
  AND token = 'OA+OdET3e3xdC/nnuCbY+IwIH0GSPFVR6csOX1y5PHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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