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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd80f2f055132a047d52e10385e32c4fb8a81c6fd592f4cd53b6ae44e699dce' 
  AND token = 'b/1hlP8WUeUONKtrEFhJRVa+23A5ARasb+A8jBnQ4GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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