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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913e3efbfb34a70b2e7c4c09100b62284b0b529666598d771dce1e7ae6dae824' 
  AND token = 'kpoWB9uJKaKP7ed4FZHSts7DcODsAySQEs9amNmvd9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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