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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b3d0621eaeb4261c0844b88ea284bce0032b1fd3e166ee2a434a5c34a49dea' 
  AND token = '9zVsoWCJFu5xIzUXmfRyJCfDSFvVAaxXISJ5YSz0mFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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