SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd4810e444ac7489e6db78287305f149787ea1ee54d3f58439cabfa5f596774' 
  AND token = '9YJm7CupSrawTau2ObXBvy1hz9wWywMavZ/nVBvui+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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