Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5603e90a393394eee6fc4e371f1e052feabb0d69084aad260eb644fc7a263a2' 
  AND token = 'YrQsXGFsS4AukwnT53dYBXLpQSUKdfTnLvVnm9WB1Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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