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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59f6a1d90c06848a71a5e585534f8f4a65e242ac6b6d05d0423b49e4d7a00fa2' 
  AND token = 'udmKe4TRj5/0lPEz2SARZIXZNpHuMXZShgqqx2IgXII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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