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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555cd74ef261065f41e9b0dba4bc1272359aa8f2db7606498dbfb41a69e02fec' 
  AND token = 'a0BNrL3yqmLkS89V7jEpfOcHOp0GvQAAE5PUB4IslCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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