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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa37fdce7290b9c85e8fe9742206d23ae5f33e0c9681cacdccedc90eaeb58e96' 
  AND token = 'Q83mFbmPWtHUzWSo61vXyyDP9IMuqehqWw6P/IWr+mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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