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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dfa1f29a6f032fff4b66c1c279b2b7bf6e4b9b09d26d76303a1593a486cb347' 
  AND token = '4O9ptYKsWOu0J5lQKh3Wm+jxB+g6Rbs17Di8EbYOLfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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