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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cfab8463b7d2bc0aa8fdcd4f2883f196f2a0639c772b0dece80184045f79ddf' 
  AND token = '9wxqPkjpJY/aNnIl8AEox9RkZs+Iwmc4el2pdehg7WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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