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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700b9da50d7418032570b47f0cec0dc8f185d06d26e87f79e75a9b1a8f51cfdb' 
  AND token = 'nwxNMqN3rHHqEtZm3OW0jvWsYUOSYJ3qXKtskJbn/9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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