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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8041649ae9d25a3cc6578600b0d750cca2b6123558654147a79a7ba2ec0ce7' 
  AND token = 'H6WDMFuFIifG85diSqucOstANo7AxSQNEJTxi/iaAhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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