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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2662fb6877e5a6db248f75d0645f6292b8ada36b52c92a87029a1ccc50a4da' 
  AND token = '/grvoajkFKCvV5W/mbfjLnhRg1LYA2X4xQaf+w2Ifv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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