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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35e144d71de72cd738addb7d7a5a2a84262ee1d4f54a29c791dd2a1260b893e' 
  AND token = 'trl2v8ikuPqG5dBAqOIhZa0jY0z79yjHGUFzMgSiImE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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