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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '490dd1718ab4e08be2f07d78b2529a4ee394f824368d33f7608143754d0a25dd' 
  AND token = 'hNZF+AvTfUdHRe5yrwByUC8C5yenUYYCSMFVI83lk2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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