Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18290bc679427e3990be0575982e732b034b1e1c3bce307bed9c22e7283d1b3' 
  AND token = 'R5CJpR8WrCmyYkOzkHNsqEcg3MhXv0N7T5yFdAgN6Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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