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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d68e74776e3bc4cd27b1c11ce9286c1985ada57a42e20d94dae3f060a9b2a96' 
  AND token = '2VntuN5FOttruRWVKGuxgf6ID3IgxJmjGU2QG9W9/l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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