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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9aadf04cfcc7e8833b9dc7289c50076d3b26cb0e75fea2e737b05de5a80efb' 
  AND token = 'ufVR447BlT2ug0HaAmedbfJP1+v9oNkfLhe8DaTWwx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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