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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd3d6c8f33e86177cd6ae81ceb6c3073cb48868bb1e39f0bfc730f81a21bbd2' 
  AND token = 'XnoJdARgbovtsX5q35gxTwCEcLhyCM7W1SSy2hDl1UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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