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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201c4ef24b5af0b78d30402ae78b9276a92f8bae8242baf63250e6d0d9be3ae2' 
  AND token = 'tCU3U12DfPlCZ9H8NV4M8hZOYglElutG7cWtMaVdojw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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