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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269eaaeaf0d684ff7d1f0960d6217f257ddff915cf1bc5c807b76cfeec73847d' 
  AND token = 'SIB9+B11Z3wZ3PtocP8GhBbiXsCE14oS53+huYUTJ1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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