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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5062bc7ceb45ce1d3958ee3a69629b6fd3bfe63f0eb45efd1694e21b911d3b37' 
  AND token = 'sZPirLO8MIThWkaOIEMy1XWLRcXbuI6fFlFWHaL+WR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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