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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff1520ddd7ef393320b8034cc7642aef8e5f419681999f5a0e3ef8db69c9b93' 
  AND token = 'NpY2WeR22wNmbIPUyWwZ7AjBgaj4WbJ5Qz/n7om4ByQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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