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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9fb8449f82b231ae2ad938954e4647e0c0e4ea03503064f8647e935ebe7be3' 
  AND token = 'YLkQS5Kq6fsCGQiZNQE83hbmAxXtXRMbCqytl1N2DuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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