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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf9c4ba80e65854f00d89ddf0ee958278c4303d2a892d30edc92c43a759d955' 
  AND token = 'wRa5Mgod+IGhJlrpJLEHuLoQZQcacX26d1IJbSyRCMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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