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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9823b8bb54d434bef205244b18edd5e9339e499ecd0362780ddce3d7883ad2f' 
  AND token = '/2DvvGBvUak5oYcTgXh4N9CPcu3n5mrJQGJ/IXWwWpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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