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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbe7a13ad37239e3098befde634391f49ea02f72aa19acfec9c6f44f2e071ea' 
  AND token = 'FWKQEZeSjE9R9W4pjPE9827WzB14Ow6mp/sBemDJ7xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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