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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a126042ad40f61d719a9c8db0f5942a305c65bd4055dd376c505341540741cba' 
  AND token = '2ZOqq2/AAw9uW1ojty/J8Mw86mxZbWYRYqGu5IbDFV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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