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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a003eabc81ebe9d8fe83642291a4f68f46ddeda46d81269e0f8764607875d8fb' 
  AND token = 'L2XO6dTDF3mwxmtUv51l+2WMbN5ka7LabzAhFw58bkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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