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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ae2c59703c96920b471ee8fb9ba44bfd427fe9b2e7285dcd6201c98b17be3e' 
  AND token = 'No5zmh7j2MBmGF0hPZxumKOi9ACOBd+nduwLoDKAsRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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