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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031064a43d63d35f4da493ec8f29ee02bfa23846103d2cfe014211ec479ea73a' 
  AND token = 'Ubpns8mS+CZ5MsOuH1MdUAX4tazGXiogdKbFbMpXK3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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