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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0af5b5d83df8c453964d5c89359390b97a181f12dec1be4cf79fad8e096e19' 
  AND token = 'LYfj9y2iCwjp/MbQ4EOdLyPtXjjUqZOLFrm5BJbxBNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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