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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02541fa3d5603475c2e75a9c144c7d23ab7eaf97a3915175ef8c105b4e3e7a7' 
  AND token = 'keN3xj3LMI+D7gVn7FvGy1EqoPHHz8rnBAxqkan7IV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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