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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be8bca6ed3bc957cc6fd58b23da1d06fa0826b31700353a76f5f93234d861e5' 
  AND token = 'dxjfLF4MM9boM2j5KqtLi+0jq/e0dN5NoCWuZIO9MDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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