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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6dc432460643e7f81a8353a42d207688b8d0770fb32a8e00b2a3f3630643bb' 
  AND token = 'ocXMK2W7GrAhwtb9PxG3h0v/RHqlX+UctJJ8vH5Brhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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