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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0b3330462f23ebb6f58a92bf02cd02bffc7068af9ce9e35da385ce54bd7b5e' 
  AND token = 'thuQ0v/RDeAFysG58zEz7H7uJbRCgjo9sZETd8H9TL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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