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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e82fea79fe8c12e8108c0d6648572646123590b353b64994f8690ef07377e9d' 
  AND token = '8QOHvWVa6VfN1jBQdB1rM/AxLb5OMonFPB87DBzt/6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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