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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd207ba896e05716c39d7267b52f4aec5f4042046a824fef89d5a9da7cc4ffec' 
  AND token = '4HGoQAzSZMjRv9kKDfzFtLWAjJYrbdm98W46o1mZerI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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