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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1069b52409f5871090117a4811f970cbe58701ca946de6edafa4edbacd589e60' 
  AND token = '30i9WcCsGTsE+vKGjkPF7ddqLUrKNGenfxDYQhv4MzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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