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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b97d5ebe136091551e9cf790971fef9ba9e26cd46d9d6d4f3ffa7c40ff458f' 
  AND token = 'YiZ3takdUfmsG272U78feV37SePVhWR6u1D7BDZxDVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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