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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9a96b44dbf3727d9cb375734f6f2fcafbcbd689bb25f8f254787391a45d58d' 
  AND token = 'bFELsTjGnPr2PX167aevdUfBZr2I/meSU+Bfic5dTfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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