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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a24314ee3f5614365942de000bd0672e023d5f505102043490058590680621' 
  AND token = 'qwVmKR9AkXHV3Y9ByDqCnVR0VbzIyVaRfccU6lfbioc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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