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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b7b44ecdb7f6ccf9b2a8157ab9629d2d58717e5272598340cd36727c1900829' 
  AND token = 'etKAyYqAIoQ5nM8VQDYceJYRqA0w0iv7U058vs/U3Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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