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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a836b4b92343d67707616eec657516f02fec0957ba36102df66dca3add6d4f9' 
  AND token = 'yEIhbwHc9nlVg/tfEuctNQir3JcVh7snphdGwG+uGqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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