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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6fdc3c595b52ea8f33ec18b633761d638706845b77dc982c609c0399339ce4' 
  AND token = 'Kn4SHvqtiae39tKg3REGoLWu6A/2BkcZCjGk2J7tEbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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